News

In LED UV photo-curing technology, LED UV curing machines, as modern curing equipment, offer numerous significant advantages over traditional UV mercury lamps, including fast curing speed, convenient operation, and environmental-friendliness without mercury. However, despite the many advantages of LED UV technology, the effect of deep curing of UV adhesives is still affected by multiple factors. This article will analyze these influencing factors in detail to help optimize the use effect of LEDUV curing machines.

LED UV Photo-Curing Energy
The energy of LED UV is a core factor affecting the deep curing effect. The light source of LED UV provides the required ultraviolet radiation, triggering photoinitiators to generate free radicals or ions, which in turn initiate chemical reactions such as polymerization, grafting, and cross-linking, thereby achieving curing. However, the supply of LED UV energy must be precisely controlled:
Excessive Energy: If the LED UV energy is too high, it may lead to energy waste and negative effects during the curing process, such as implosion or incomplete curing. This not only wastes energy but may also affect the quality of the final product.
Insufficient Energy: If the LED UV energy is insufficient, it may fail to trigger sufficient chemical reactions, resulting in incomplete curing. Therefore, the LED UV energy should be reasonably adjusted according to the specific requirements of UV coatings and photoinitiators.

UV Coating Thickness
The thickness of the UV coating has an important impact on the curing effect. When the coating is too thick, under the same power light source, the curing time will be correspondingly prolonged, and it may also cause the surface temperature of the substrate to be too high, thereby causing substrate deformation. Conversely, a coating that is too thin may result in poor surface gloss. Therefore, the coating thickness should be adjusted according to actual use conditions (such as hue, temperature, curing speed, and substrate surface) to obtain the best curing effect.

UV Curing Distance
The distance between the LED UV light source and the cured substrate is another key factor affecting the curing effect. Usually, the curing distance should be maintained within the range of 10-15mm, and the specific distance should be adjusted according to the type of substrate, coating thickness, and power of the light source. If the distance is too far, it may lead to uneven curing, while if the distance is too close, it may result in local overheating.

Curing Speed
The adjustment of curing speed is also crucial for the final effect. Different substrates and coatings require different curing speeds. If the curing speed is too fast, it may result in surface curing but incomplete internal curing, thus causing adhesion problems; while if the curing speed is too slow, it may lead to substrate surface aging. Properly adjusting the curing speed is the key to ensuring complete curing.

Working Environment
The influence of the working environment on UV curing effect should not be ignored. The viscosity of UV coatings is affected by changes in room temperature, so the ambient temperature should be maintained between 15-25℃. During the curing process, avoid exposing the UV coating to direct sunlight to prevent temperature fluctuations from interfering with the curing effect.